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A thermostat is a device which maintains the temperature of a place or an object constant. The word thermostat is derived from two Greek words, ‘thermo’ meaning heat and ‘static’ meaning staying the same. Thermostats are used in any device or system that gets heated or cools down to a pre-set temperature. It turns an appliance or a circuit on or off when a particular temperature is reached. Devices which use thermostat include building heater, central heater in a room, air conditioner, water heater, as well as kitchen equipments including oven and refrigerators. Sometimes, a thermostat functions both as the sensor and the controller of a thermal system.
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